With Automatic Transaxle (ATX)

GENERAL SYSTEM OPERATION
The Powertrain Control System consists of various sensors, switches, Engine Control Module (ECM) and Transaxle Control Module (TCM). The sensors and switches act as inputs to the Control Modules.

The sensors and switches (inputs) send the Control Modules data concerning engine and transaxle operating conditions. The Control Modules share and interpret this data in order to control various output devices. The output devices control air intake amounts, the amount of fuel injection, fuel injection timing, evaporative emissions, idle-up, deceleration, ignition timing, automatic transaxle (ATX) shifting and torque converter lockup operation. The Control Modules have varying amounts of control over these (outputs).

By controlling these outputs, the Control Modules can meet the different operational and driveability needs of the engine and transaxle as they experience different operating conditions and requirements.

Engine Control System Inputs
- Air conditioning switch.
- Barometric pressure sensor
- Braking signal (Brake switch)
- Cranking signal (ignition switch START position)
- Camshaft position sensor (in distributor)
- SGC Signal (represents No.1 cylinder TDC)
- SGT Signal (represents crankshaft angle in 180° intervals)
- Data link connector TEN terminal (initial set signal, for self diagnosis initiation)
- E/L operation (represents electrical load)
- Coolant fan relay
- Headlights
- Blower motor
- Rear window defroster
- Engine coolant temperature sensor
- Heated oxygen sensor
- Intake air temperature sensor
- Mass air flow sensor
- Transaxle range switch (ATX)
- Power steering pressure switch
- Throttle position sensor
- Transaxle operation signals (from transaxle control module)
- [1][2]Vehicle speed sensor

Engine Control System Outputs
- Air conditioner relay (A/C cut off)
- Coolant fan control (coolant fan relay)
- Data link connector (monitor function, output to self diagnosis checker)
- EGR control system (EGR solenoid valves)
- Fail-safe function (output to malfunction indicator lamp and self diagnosis checker)
- Fuel injector
- Fuel pump relay
- Idle speed control system (idle air control valve)
- Ignition timing control (ignition control module)
- Purge control system (purge solenoid valve)
- Pressure regulator control (PRC) system (PRC solenoid valves)
- Torque reduced signal/ coolant temperature signal (to transaxle control module, for ATX)
- Variable inertia charging system (VICS) (VICS solenoid valve)